CAS 7664-41-7 appears in our catalog under these names: Ammonia Standard: NH3 @ 100 µg/mL in H2O, Ammonia Standard: NH3 @ 1000 µg/mL in H2O, Ammonia Standard: NH3 @ 10000 µg/mL in H2O, NH3 as N: 1000µg/mL in H20, Ammonia, 2M in methanol . Offered by: VHG, Thermo Scientific (Alfa Aesar), Chemat, TCI, Thermo Scientific (Acros). Available pack sizes: 500ml, 100ml, 1000ml, 1l, 800ML, 2.5l, 25ML, 25l.